Square silencer shell folding machine and machining method

Abstract

The invention relates to the technical field of silencer machining, in particular to a square silencer shell folding machine and a machining method. According to the square folding machine, in a conveying unit, a plurality of conveying rollers are arranged in parallel at intervals; and the horizontally arranged conveying roller is rotationally connected with the bracket. In the traction unit, a first rolling shaft and a second rolling shaft are movably connected with the support unit respectively; the first rolling shaft is parallel to the second rolling shaft and parallel to the conveying roller; the first driving part adjusts the distance between the first rolling shaft and the second rolling shaft; the second driving part drives the first rolling shaft and the second rolling shaft to rotate in the opposite directions. In the bending unit, a third driving part adjusts the position of a bending part movably connected with the support unit. In the first state, the height of the upper side of the bending part is lower than that of the upper side of the second rolling shaft; and in the second state, the bending part abuts against the second rolling shaft, and the first rolling shaft and the bending part are in interference fit with the plate. Therefore, the problem of how to improve the bending quality of the square silencer shell bending machine on the plate is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of muffler processing, and more specifically, to a square muffler housing folding machine and a processing method thereof. Background Art

[0002] When an automobile engine is operating, it will generate strong exhaust noise, so a muffler is required. There are various types of muffler housings, such as circular, square, etc. The square housing is more convenient to install in specific positions such as the automobile chassis and can better adapt to the limited space layout at the bottom of the vehicle. In addition, the square structure is convenient for designing more complex sound-absorbing chambers and pipe layouts inside.

[0003] Currently, the manufacturing of the square muffler housing mainly uses metal sheets as the base material, and the structural construction is realized through the technological process of blanking, stamping, bending and welding assembly. In the specific implementation process, first, the sheet is numerically controlled cut according to the design parameters, and then the hydraulic press or mechanical press is used to complete the stamping of the reinforcing ribs and mounting holes. The core processing link is the bending process. The sheet is multi-axis linked and bent by a numerical control bending machine to form a shell component with a specific geometric shape. Finally, the argon arc welding or laser welding technology is used to hermetically connect the bent surfaces. The precision control of the bending process is directly related to the dimensional tolerance and assembly clearance of the housing, while the welding quality affects the sealing performance and mechanical strength of the overall structure.

[0004] The defects of the existing technology mainly stem from the physical characteristics of the bending process and the limitations of process control. When the sheet bears the bending stress, the lattice structure inside the material will undergo plastic deformation, and its springback effect interacts with the friction force on the contact surface of the die, resulting in the actual bending angle deviating from the preset parameters. This deviation shows a cumulative effect due to factors such as die wear, material thickness tolerance, and equipment hydraulic fluctuation during the continuous processing, especially when processing materials with a large elastic modulus such as high-strength steel or aluminum alloy. The key problem points are mainly manifested as: excessive springback caused by insufficient matching between the process parameter setting and the material mechanical properties, surface indentation defects caused by uneven stress distribution on the contact surface between the die and the sheet, and assembly interference caused by the positioning reference error in the multi-process connection. Summary of the Invention

[0005] To solve the problem of how to improve the quality of the square muffler housing folding machine for bending the sheet, the present invention provides a square muffler housing folding machine and a processing method thereof.

[0006] In a first aspect, the present invention provides a square muffler housing folding machine, and the square muffler housing folding machine includes: Conveying unit, the conveying unit includes a bracket and a plurality of conveying rollers; the plurality of conveying rollers are parallel to each other and arranged at intervals; the direction in which the plurality of conveying rollers are arranged is perpendicular to their own axes; the conveying rollers are rotatably connected to the bracket; the conveying rollers are horizontally arranged; Support unit; Traction unit, the traction unit includes a first roller, a second roller, a first driving part and a second driving part; the first roller is movably connected to the support unit; the second roller is movably connected to the support unit; the first roller is parallel to the second roller; the first roller is parallel to the conveying roller; the first roller is located above the second roller; the first driving part adjusts the distance between the first roller and the second roller; the second driving part drives the first roller and the second roller to rotate in opposite directions; the first driving part and the second driving part are respectively detachably connected to the support unit; Bending unit, the bending unit is located on the side of the traction unit away from the conveying unit; the bending unit includes a bending part and a third driving part; the bending part is movably connected to the support unit; the third driving part is detachably connected to the support unit; the third driving part adjusts the position of the bending part; The square muffler housing square bending machine has a first state and a second state; in the first state, the upper side height of the bending part is lower than the upper side height of the second roller; in the second state, the bending part abuts against the second roller, and the gap between the first roller and the bending part is in interference fit with the plate.

[0007] In some embodiments, the first driving part drives the first roller to move up and down; the position of the second roller on the support unit is fixed; The traction unit further includes a positioning seat and a fourth driving part; the positioning seat is slidably connected to the support unit; the fourth driving part is detachably connected to the support unit; the fourth driving part drives the positioning seat to slide; the sliding direction of the positioning seat is parallel to the axis of the first roller; a positioning groove is formed on the positioning seat; in the second state, one end of the first roller is inserted and matched with the positioning seat.

[0008] In some embodiments, the bending part includes a movable seat and a plurality of rollers; the rollers are rotatably connected to the movable seat; the rollers are parallel to the first roller; the plurality of rollers are coaxial and arranged at intervals; the rollers are located on the side of the movable seat facing the second roller; the diameter of the rollers is smaller than the diameter of the second roller.

[0009] In some embodiments, in the first state, the rollers are tangent to the second roller; The third driving part drives the bending part to rotate around the axis of the second roller.

[0010] In some embodiments, the square muffler housing square bending machine further includes a jacking unit; the jacking unit is located between the support unit and the conveying unit; the jacking unit includes a jacking plate and a fifth driving part; the jacking plate is horizontally arranged; the fifth driving part drives the jacking plate to move up and down vertically; The vertical cross-section of the jacking plate is trapezoidal with a narrow upper part and a wide lower part; or, the upper surface of the jacking plate is an arc surface.

[0011] In some embodiments, the square muffler housing square bending machine further includes an image unit; the image unit is used to capture the end face image of the plate during the bending process and calculate the center of gravity of the part of the plate that has been rolled by the traction unit.

[0012] In a second aspect, the present invention provides a method for processing a square muffler housing, and the method for processing a square muffler housing is applied to the square muffler housing square bending machine according to any one of the above embodiments. The method for processing a square muffler housing includes: Step S10, based on the conveying unit, convey the plate to be processed between the first roller and the second roller, and control the first roller and the second roller to clamp the plate; Step S20, based on the plate being in a clamped state, control the first roller and the second roller to rotate in opposite directions until the plate moves a first distance; Step S30, based on the plate moving the first distance, control the first roller and the second roller to stop rotating; Step S40, based on the plate being in a stationary state and the square muffler housing square bending machine being in a first state, control the bending part to move towards between the first roller and the second roller until the square muffler housing square bending machine is in a second state; in the first state, the upper side height of the bending part is lower than the upper side height of the second roller; in the second state, the bending part abuts against the second roller, and the first roller and the bending part clamp the plate; Step S50, based on the square muffler housing square bending machine being in the second state, control the first roller and the second roller to rotate in opposite directions until the plate moves a second distance; the second distance is less than the first distance; Step S60, based on the plate moving the second distance, control the first roller and the second roller to stop rotating; Step S70, based on the fact that the sheet is in a stationary state and the square muffler housing folding machine is in the second state, control the bending part to move away from the first roller until the square muffler housing folding machine is in the first state; Step S80, repeat steps S20 to S70 until the processing is completed.

[0013] In some embodiments, the square muffler housing folding machine further includes a lifting unit; the lifting unit is located between the support unit and the bracket; the lifting unit includes a lifting plate and a fifth driving part; the lifting plate is horizontally arranged; the fifth driving part drives the lifting plate to lift vertically; The step S20 includes: Step S21, based on the fact that the sheet is in a clamped state, control the lifting plate to rise until the upper surface of the lifting plate is higher than the upper side height of the conveying roller; Step S22, based on the fact that the upper surface of the lifting plate is higher than the upper side height of the conveying roller, control the first roller and the second roller to rotate in opposite directions until the sheet moves a first distance.

[0014] In some embodiments, the step S80 includes: Repeat steps S20 to S70 until the processing is completed; Among them, in the first repetition process, the first distance is the first reserved length; in the second repetition process, the first distance is the second reserved length; in the third repetition process, the first distance is the third reserved length; in the fourth repetition process, the first distance is the fourth reserved length; The first reserved length, the second reserved length, the third reserved length, and the fourth reserved length satisfy the following relationship: L1 < L2; L1 < L3; L1 < L4; L1 < L5; L5 = L - L1 - L2 - L3 - L4; (L1 + L5) > L3; L2 = L4; Among them, L is the total length of the sheet along the traction traveling direction; L1 is the first reserved length; L2 is the second reserved length; L3 is the third reserved length; L4 is the fourth reserved length; L5 is the remaining length of the sheet after being bent four times.

[0015] In some embodiments, the square muffler housing folding machine further includes an image unit; the image unit is used to capture the end face image of the sheet bending process and calculate the center of gravity of the part of the sheet that has been rolled by the traction unit; The step S50 includes: Step S51, based on the square muffler housing folding machine being in the second state, obtaining the center of gravity position calculated by the image unit; Step S52, based on the center of gravity being located on a side of the traction unit close to the bending unit, controlling the first roller and the second roller to rotate in opposite directions at a first speed; Step S53, based on the center of gravity being located on the side of the traction unit away from the bending unit, controlling the first roller and the second roller to rotate in opposite directions at a second speed; the second speed being greater than the first speed; Step S54, repeating steps S52 to S53 until the plate moves a second distance, and the second distance is smaller than the first distance.

[0016] In order to solve the problem of how to improve the quality of the square muffler shell folding machine for bending the plate, the present invention has the following advantages: Through the coordinated action of the traction unit and the bending unit, the plate can be conveyed horizontally under the clamping of the traction unit in the first state of the square folding machine. In the process of switching the square folding machine from the first state to the second state, the traction unit clamps the plate and stops traction, and the bending part is lifted upward to bend the plate to a certain angle, which is the first stage of bending. After the square folding machine reaches the second state, the bending part remains stationary, and a continuous arc-shaped bending path along the outer contour of the first roller is formed between the bending part, the first roller and the second roller. The traction unit pulls the plate to move, and the plate continues to bend by the constraint of the arc-shaped bending path during the traction process, which is the second stage of bending. The present invention utilizes the compact structure formed between the bending part, the first roller and the second roller to improve the uniformity and consistency of the bending part of the plate, and improves the bending quality and bending efficiency. At the same time, compared with the method of bending the plate 90° by one movement of the bending part, the present invention simplifies the structural composition of the square folding machine, achieving the effect of high efficiency, high quality and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a square muffler housing folding machine according to an embodiment is shown in a first viewing angle; Figure 2 Shows Figure 1 A schematic diagram of a square muffler housing folding machine in an embodiment at a second viewing angle; Figure 3 Shows Figure 1 A schematic top view of a square muffler housing folding machine in an embodiment; Figure 4 Shows Figure 1 A schematic side view of a square muffler housing folding machine in an embodiment; Figure 5Shows a schematic diagram of a square muffler housing folding machine of an embodiment in a first state; Figure 6 Shows a schematic diagram of a square muffler housing folding machine of an embodiment in a second state; Figure 7 Shows a schematic diagram of the center of gravity position being on the side of the traction unit close to the bending unit during the bending process of a sheet; Figure 8 Shows a schematic diagram of the center of gravity position being on the side of the traction unit away from the bending unit during the bending process of a sheet; Figure 9 Shows a schematic diagram after the bending of a sheet of an embodiment is completed; Figure 10 Shows a schematic flow diagram of a method for processing a square muffler housing of an embodiment.

[0018] Reference numerals: 10 conveying unit; 11 conveying rollers; 12 brackets; 20 support unit; 21 first support; 22 second support; 30 traction unit; 31 first roller; 32 second roller; 33 positioning seat; 34 positioning groove; 40 bending unit; 41 bending part; 411 movable seat; 412 rollers; 50 lifting unit; 51 lifting plate; 52 fifth driving part; 60 sheet. Detailed implementation manners

[0019] Now, the content of the present disclosure will be discussed with reference to several exemplary embodiments. It should be understood that discussing these embodiments is only to enable those of ordinary skill in the art to better understand and thus implement the content of the present disclosure, rather than implying any limitation to the scope of the present disclosure.

[0020] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances. In addition, the terms "installed", "arranged", "provided with", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0021] As a noise reduction device, the outer shell of a square muffler is usually installed by welding the whole after the sheet metal 60 is bent by a bending device. During the process of the bending device producing the outer shell of the square muffler, the bending position, angle, path, etc. of the processed sheet metal 60 will affect the quality of the bending of the sheet metal 60, and problems such as excessive bending angle of the sheet metal 60, damage to the sheet metal 60 during bending, and incomplete bending of the sheet metal 60 are likely to occur.

[0022] To solve the above problems, the present embodiment discloses a square muffler outer shell square bender. In the present embodiment, as Figure 1 、 Figure 2As shown in the figure, the square muffler housing square folding machine may include a conveying unit 10, a support unit 20, a traction unit 30, and a bending unit 40. The conveying unit 10 may include a bracket 12 and a plurality of conveying rollers 11; the plurality of conveying rollers 11 may be parallel to each other and arranged at intervals; the arrangement direction of the plurality of conveying rollers 11 is perpendicular to their own axes; the conveying rollers 11 may be rotatably connected to the bracket 12; the conveying rollers 11 may be horizontally arranged. By rotatably connecting the horizontally arranged conveying rollers 11 to the bracket 12, the stable conveying of the sheet 60 in the horizontal state can be realized, and a limiting part may be added at both ends of the conveying rollers 11 along their own axes to reduce the offset of the sheet 60 during the conveying process.

[0023] The traction unit 30 may include a first roller 31, a second roller 32, a first driving part, and a second driving part; the first roller 31 may be movably connected to the support unit 20; the second roller 32 may be movably connected to the support unit 20; the first roller 31 and the second roller 32 may be parallel; the first roller 31 and the conveying rollers 11 may be parallel; the first roller 31 may be located above the second roller 32; the first driving part may adjust the distance between the first roller 31 and the second roller 32; the second driving part may drive the first roller 31 and the second roller 32 to rotate in opposite directions; the first driving part and the second driving part may be detachably connected to the support unit 20 respectively. Through the roller structure with adjustable distance and the bidirectional driving device, the clamping requirements of sheets 60 with different thicknesses can be adapted, and at the same time, the precise control of the bidirectional traction action can be realized. The bending unit 40 may be located on the side of the traction unit 30 away from the conveying unit 10.

[0024] The bending unit 40 may include a bending part 41 and a third driving part; the bending part 41 may be movably connected to the support unit 20; the third driving part may be detachably connected to the support unit 20; the third driving part may adjust the position of the bending part 41. Through the movably connected bending part 41 and the adjustable driving device, a deformable bending path is formed to meet the bending process requirements at different stages. The first driving part, the second driving part, and the third driving part may be existing driving methods such as motors and hydraulic presses. The square muffler housing square folding machine may have a first state and a second state; in the first state, the upper side height of the bending part 41 may be lower than the upper side height of the second roller 32; in the second state, the bending part 41 may be pressed against the second roller 32, and the gap between the first roller 31 and the bending part 41 may be in interference fit with the sheet 60. Through the dual-state switching structure, a traction channel is formed in the first state, and a compact bending path is formed in the second state, so that after the sheet 60 is initially bent in a stationary state, an accurate arc bending path can be gradually formed during the traction process, improving the bending forming accuracy.

[0025] When the square muffler housing folding machine switches from the first state to the second state, the bending part 41 needs to lift upward from the lower surface of the plate 60 to bend the plate 60. And in the state where the bending part 41 is in contact with the second roller 32, the bending part 41 is closer to the clamping part of the plate 60 in the traction unit 30, which can make the bending arc of the plate 60 fit the first roller 31 better. Thus, an arc-shaped bending path along the outer surface of the first roller 31 formed by the first roller 31, the second roller 32, and the bending part 41 can enable the plate 60 to be automatically bent and formed under the continuous traction of the traction unit 30. Subsequently, the square muffler housing folding machine is switched from the second state to the first state, that is, the bending part 41 disengages from the first roller 31, and the plate 60 continues to be tractioned. In this way, by repeating the process, the plate 60 can be bent four times to form a square housing, as Figure 9 shown. The present invention utilizes the coordinated cooperation of the traction unit 30 and the bending part 41. In the first stage, when the bending part 41 switches from the first state to the second state, the plate 60 is in a state of stopped traction for bending. In the second stage, the bending part 41 maintains the second state, and the bending part 41, the first roller 31, and the second roller 32 form a compact bending path. Under the continuous traction of the traction unit 30, the plate 60 is bent during the traction process, so that each bending process of the plate 60 is carried out in stages, the bending angle each time is relatively small, and the force-bearing part of the plate 60 is relatively concentrated, so that the bending arc fits the first roller 31 better, improving the bending quality.

[0026] In this embodiment, as Figure 1 , Figure 2 shown, the first driving part can drive the first roller 31 to move up and down; the position of the second roller 32 can be fixed on the support unit 20. Through the combination of the fixed second roller 32 and the liftable first roller 31, a stable clamping reference surface is formed. The traction unit 30 can further include a positioning seat 33 and a fourth driving part; the positioning seat 33 can be slidably connected to the support unit 20; the fourth driving part can be detachably connected to the support unit 20; the fourth driving part can drive the positioning seat 33 to slide; the sliding direction of the positioning seat 33 can be parallel to the axis of the first roller 31; a positioning groove 34 can be provided on the positioning seat 33; in the second state, one end of the first roller 31 can be inserted and matched with the positioning seat 33. Through the sliding of the positioning seat 33 and the insertion and matching of the positioning groove 34, a double positioning constraint is formed when adjusting the position of the first roller 31, ensuring the axis parallelism during the lifting process of the first roller 31 and improving the stability of the traction unit 30 for clamping the plate 60.

[0027] In some other embodiments, both the first roller 31 and the second roller 32 can be lifted under the drive of the first driving part, so that the first roller 31 and the second roller 32 move closer to or away from each other, thereby realizing rapid clamping of the plate 60 and also facilitating adjustment of the position of the clamping reference surface.

[0028] In some other embodiments, the support unit 20 may include a first support 21 and a second support 22. The first support 21 and the second support 22 are arranged at intervals. The first roller 31, the second roller 32, and the bending part 41 are all arranged between the first support 21 and the second support 22. The positioning seat 33 is located at one end of the second support 22.

[0029] In this embodiment, as Figure 1 , Figure 2 shown, the bending part 41 may include a movable seat 411 and a plurality of rollers 412; the rollers 412 may be rotatably connected to the movable seat 411; the sheet 60 can drive the rollers 412 to rotate under the traction of the traction unit 30, converting sliding friction into rolling friction during the bending process and reducing the risk of surface scratches on the sheet 60. The axis of the roller 412 may be parallel to the axis of the first roller 31; the plurality of rollers 412 may be coaxial and arranged at intervals; the rollers 412 may be located on the side of the movable seat 411 facing the second roller 32; the diameter of the roller 412 may be smaller than the diameter of the second roller 32. By adopting the small-diameter roller 412 array structure, the compactness of the bending path is maintained. Compared with using a single long roller 412, the present invention uses a plurality of shorter rollers 412 to disperse the load, and the wear of a single roller 412 is not likely to affect the rotation of other rollers 412, improving the rotation smoothness of the rollers 412 of the equipment.

[0030] In this embodiment, as Figure 5 , Figure 6 shown, in the first state, the roller 412 may be tangent to the second roller 32; the third driving part may drive the bending part 41 to rotate around the axis of the second roller 32. Through the movement track of the bending part 41 rotating around the axis, a continuous bending path tangent to the outer surface of the second roller 32 is formed, ensuring that the sheet 60 maintains a uniform radius of curvature during the bending process, improving the smoothness of the bending arc, and thus improving the bending quality of the sheet 60.

[0031] In this embodiment, as Figure 3 , Figure 4As shown, the square muffler housing square bending machine may further include a lifting unit 50; the lifting unit 50 may be located between the support unit 20 and the conveying unit 10; the lifting unit 50 may include a lifting plate 51 and a fifth driving part 52; the lifting plate 51 may be horizontally arranged; the fifth driving part 52 may drive the lifting plate 51 to lift and lower vertically. Through the structure of the liftable lifting plate 51, auxiliary support is formed during the conveying of the sheet 60. Usually, the sheet 60 needs to be bent 4 times to form a square housing. During the multiple bending processes, the angle bent first is likely to be deformed due to the swinging of the sheet 60, that is, the angle increases. In the present invention, during the bending process, the lifting plate 51 can be in a raised state, and the sheet 60 can be lifted by the lifting plate 51 by an arc, so that the sheet 60 can be pre-attached to the surface of the first roller 31 before entering the gap between the first roller 31 and the second roller 32, thereby improving the bending arc of the sheet 60 between the traction unit 30 and the bending part 41, enabling the sheet 60 to minimize the influence of the swinging of the sheet 60 on the increase of the bending angle during the multiple bending processes, and ensuring the convenience of butt welding at both ends of the sheet 60 after bending. The vertical cross-section of the lifting plate 51 may be a trapezoid with a narrow upper part and a wide lower part; or, the upper surface of the lifting plate 51 may be an arc surface. Through the trapezoidal cross-section or arc surface design, a progressive contact surface is formed during the lifting process, avoiding local stress concentration of the sheet 60, and at the same time guiding the sheet 60 to form a pre-bending arc, reducing the material springback during the subsequent bending process.

[0032] In this embodiment, the square muffler housing square bending machine may further include an image unit; the image unit may be used to capture the end face image of the bending process of the sheet 60 and calculate the center of gravity of the part of the sheet 60 that has been rolled by the traction unit 30. Through image acquisition and center of gravity analysis, the attitude change of the sheet 60 during the bending process is monitored in real time, providing data support for process parameter adjustment, and ensuring the dynamic balance of the bending process to improve the bending quality of the sheet 60.

[0033] This embodiment discloses a method for processing a square muffler housing. The method for processing a square muffler housing can be applied to the square muffler housing square bending machine in any of the above embodiments. In this embodiment, as Figure 10 shown, the method for processing a square muffler housing may include a loop execution process from step S10 to step S80. The above steps will be described in detail below: Step S10, based on the conveying unit 10, convey the sheet 60 to be processed between the first roller 31 and the second roller 32, and control the first roller 31 and the second roller 32 to clamp the sheet 60; Step S20, based on the sheet 60 being in a clamped state, control the first roller 31 and the second roller 32 to rotate in opposite directions until the sheet 60 moves a first distance; Step S30: Based on the movement of the plate 60 by a first distance, control the first roller 31 and the second roller 32 to stop rotating; Step S40: Based on the fact that the plate 60 is in a stationary state and the square muffler housing folding machine is in a first state, control the bending part 41 to move towards the space between the first roller 31 and the second roller 412 until the square muffler housing folding machine is in a second state; in the first state, the upper side height of the bending part 41 is lower than the upper side height of the second roller 412; in the second state, the bending part 41 presses against the second roller 32, and the first roller 31 and the bending part 41 clamp the plate 60; wherein, in the first state, the first roller 31 and the second roller 32 may clamp the plate 60, or the gap between the first roller 31 and the second roller 32 may be greater than the thickness of the plate 60.

[0034] Step S50: Based on the fact that the square muffler housing folding machine is in the second state, control the first roller 31 and the second roller 32 to rotate in opposite directions until the plate 60 moves a second distance; the second distance is less than the first distance; the second distance generated during the bending process is the length of the plate 60 being rolled and pulled through the coordinated cooperation of the traction unit 30 and the bending part 41, that is, the arc distance of the plate 60 moving in the circumferential direction around the first roller 31.

[0035] Step S60: Based on the movement of the plate 60 by the second distance, control the first roller 31 and the second roller 32 to stop rotating; Step S70: Based on the fact that the plate 60 is in a stationary state and the square muffler housing folding machine is in the second state, control the bending part 41 to move away from the first roller 31 until the square muffler housing folding machine is in the first state; Step S80: Repeat steps S20 to S70 until the processing is completed.

[0036] By controlling the movement distance and bending state of the plate 60 in stages through the above steps, the single bending is decomposed into two stages. When the traction unit 30 stops the traction state, the plate 60 is in a stationary state, and the initial bending angle is formed in the stationary bending stage. When the bending part 41 is in the second state, the traction unit 30 starts to traction, and the bending arc is gradually improved in the traction bending stage. Through the compact structural cooperation of the traction unit 30 and the bending unit 40, and by precisely controlling the movement distance of each stage, the dimensional accuracy after four - time bending forming is improved.

[0037] In this embodiment, the square muffler housing folding machine further includes a jacking unit 50; the jacking unit 50 is located between the support unit 20 and the bracket 12; the jacking unit 50 includes a jacking plate 51 and a fifth driving part 52; the jacking plate 51 is horizontally arranged; the fifth driving part 52 drives the jacking plate 51 to lift and lower vertically; Step S20 may include: Step S21: Based on the fact that the sheet 60 is in a clamped state, control the lifting plate 51 to rise until the upper surface of the lifting plate 51 is higher than the upper side height of the conveying roller 11. Step S22: Based on the fact that the upper surface of the lifting plate 51 is higher than the upper side height of the conveying roller 11, control the first roller 31 and the second roller 32 to rotate in opposite directions until the sheet 60 moves a first distance. By lifting the lifting plate 51 before traction to form a pre-bending arc of the sheet 60, the sheet 60 can be kept in contact with the first roller 31 when entering the traction unit 30, improving the stress distribution state during the bending process, reducing the traction resistance and reducing the material dislocation during the subsequent bending process, and improving the consistency of the bending angle.

[0038] In this embodiment, step S80 may include repeating steps S20 to S70 until the processing is completed. Among them, during the first repetition, the first distance is the first reserved length; during the second repetition, the first distance is the second reserved length; during the third repetition, the first distance is the third reserved length; during the fourth repetition, the first distance is the fourth reserved length. The first reserved length, the second reserved length, the third reserved length, and the fourth reserved length satisfy the following relationships: L1 < L2; L1 < L3; L1 < L4; L1 < L5; L5 = L - L1 - L2 - L3 - L4; (L1 + L5) > L3; L2 = L4; Among them, L is the total length of the sheet 60 along the traction direction; L1 is the first reserved length; L2 is the second reserved length; L3 is the third reserved length; L4 is the fourth reserved length; L5 is the remaining length of the sheet 60 after four bends. By controlling the process parameters of the first distance in batches, while forming a square structure during the four bends of the sheet 60, a differentiated process margin is formed, so that enough butt margin is reserved at the final weld position for welding, and at the same time, the stress distribution of each bend section is balanced, preventing dimensional deviation caused by the swing of one end of the sheet 60 along the traction direction.

[0039] In this embodiment, the square muffler housing folding machine further includes an image unit; the image unit is used to capture the end face image of the bending process of the sheet 60 and calculate the center of gravity of the part of the sheet 60 that is rolled by the traction unit 30. Step S50 includes: Step S51: Based on the fact that the square muffler housing folding machine is in the second state, obtain the center of gravity position calculated by the image unit. Step S52: Based on the fact that the center of gravity position is on the side of the traction unit 30 close to the bending unit 40, control the first roller 31 and the second roller 32 to rotate in opposite directions at a first rotational speed; as Figure 7As shown, in this case, the sheet 60 has an inertia with an enlarged angle, so that the rotation speed can be reduced to avoid the adverse effect of the enlarged angle on the alignment welding after bending.

[0040] Step S53: Based on the center of gravity being located on the side of the traction unit 30 away from the bending unit 40, control the first roller 31 and the second roller 32 to rotate in opposite directions at a second rotation speed; the second rotation speed is greater than the first rotation speed; as Figure 8 shown, in this case, the sheet 60 has an inertia with a reduced angle, so that the rotation speed can be increased.

[0041] Step S54: Repeat Step S52 to Step S53 until the sheet 60 moves a second distance, and the second distance is less than the first distance. By dynamically adjusting the traction speed by real-time monitoring the center of gravity position of the sheet 60 and adopting a differential rotation speed combination when the center of gravity deviates, the processing efficiency is optimized on the premise of ensuring the forming quality of the sheet 60, and excessive deformation of the material is prevented.

[0042] It should be understood that the "present embodiment" mentioned in the present invention refers to the current technical points. Multiple "present embodiments" can be the same embodiment or different embodiments.

[0043] Those of ordinary skill in the art can understand that the above embodiments are specific cases for implementing the present disclosure, and in practical applications, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A square muffler housing folding machine, characterized in that The square muffler housing folding machine includes: A conveying unit, which includes a bracket and a plurality of conveying rollers; the plurality of conveying rollers are parallel to each other and arranged at intervals; the arrangement direction of the plurality of conveying rollers is perpendicular to their own axes; the conveying rollers are rotatably connected to the bracket; the conveying rollers are horizontally arranged; A support unit; A traction unit, which includes a first roller, a second roller, a first driving part and a second driving part; the first roller is movably connected to the support unit; the second roller is movably connected to the support unit; the first roller is parallel to the second roller; the first roller is parallel to the conveying roller; the first roller is located above the second roller; the first driving part adjusts the distance between the first roller and the second roller; the second driving part drives the first roller and the second roller to rotate in opposite directions; the first driving part and the second driving part are respectively detachably connected to the support unit; A bending unit, which is located on the side of the traction unit away from the conveying unit; the bending unit includes a bending part and a third driving part; the bending part is movably connected to the support unit; the third driving part is detachably connected to the support unit; the third driving part adjusts the position of the bending part; The square muffler housing folding machine has a first state and a second state; in the first state, the upper side height of the bending part is lower than the upper side height of the second roller; in the second state, the bending part abuts against the second roller, and the gap between the first roller and the bending part is in interference fit with the sheet material.

2. The square muffler housing folding machine according to claim 1, wherein The first driving part drives the first roller to move up and down; the position of the second roller on the support unit is fixed; The traction unit further includes a positioning seat and a fourth driving part; the positioning seat is slidably connected to the support unit; the fourth driving part is detachably connected to the support unit; the fourth driving part drives the positioning seat to slide; the sliding direction of the positioning seat is parallel to the axis of the first roller; a positioning groove is provided on the positioning seat; in the second state, one end of the first roller is inserted and matched with the positioning seat.

3. The square muffler housing folding machine according to claim 2, wherein The bending part includes a movable seat and a plurality of rollers; the rollers are rotatably connected to the movable seat; the rollers are parallel to the first roller; the plurality of rollers are coaxially arranged and spaced apart; the rollers are located on the side of the movable seat facing the second roller; the diameter of the rollers is smaller than the diameter of the second roller.

4. The square muffler housing folding machine according to claim 3, wherein In the first state, the rollers are tangent to the second roller; The third driving part drives the bending part to rotate around the axis of the second roller.

5. The square muffler housing folding machine according to claim 1, wherein The square muffler housing flanging machine further includes a jacking unit; the jacking unit is located between the support unit and the conveying unit; the jacking unit includes a jacking plate and a fifth driving part; the jacking plate is horizontally arranged; the fifth driving part drives the jacking plate to lift and lower vertically. The vertical cross-section of the jacking plate is a trapezoid with a narrow upper part and a wide lower part; or, the upper surface of the jacking plate is an arc surface.

6. The square muffler housing flanging machine according to claim 1, wherein the square muffler housing flanging machine further includes an image unit; the image unit is used to capture the end face image of the sheet metal bending process and calculate the center of gravity of the part of the sheet metal that has been rolled by the traction unit.

7. A method for processing a square muffler housing, which is applied to the square muffler housing flanging machine according to any one of claims 1-6; characterized in that the method for processing a square muffler housing includes: Step S10, based on the conveying unit, convey the sheet metal to be processed between the first roller and the second roller, and control the first roller and the second roller to clamp the sheet metal. Step S20, based on the sheet metal being in a clamped state, control the first roller and the second roller to rotate in opposite directions until the sheet metal moves a first distance. Step S30, based on the sheet metal moving the first distance, control the first roller and the second roller to stop rotating. Step S40, based on the sheet metal being in a stationary state and the square muffler housing flanging machine being in a first state, control the bending part to move towards the space between the first roller and the second roller until the square muffler housing flanging machine is in a second state; in the first state, the upper side height of the bending part is lower than the upper side height of the second roller; in the second state, the bending part abuts against the second roller, and the first roller and the bending part clamp the sheet metal. Step S50, based on the square muffler housing flanging machine being in the second state, control the first roller and the second roller to rotate in opposite directions until the sheet metal moves a second distance; the second distance is less than the first distance. Step S60, based on the sheet metal moving the second distance, control the first roller and the second roller to stop rotating. Step S70, based on the sheet metal being in a stationary state and the square muffler housing flanging machine being in the second state, control the bending part to move away from the first roller until the square muffler housing flanging machine is in the first state. Step S80, repeat steps S20 to S70 until the processing is completed.

8. The method for processing a square muffler housing according to claim 7, wherein the square muffler housing flanging machine further includes a jacking unit; the jacking unit is located between the support unit and the bracket; the jacking unit includes a jacking plate and a fifth driving part; the jacking plate is horizontally arranged; the fifth driving part drives the jacking plate to lift and lower vertically. Step S20 includes: Step S21: Based on the fact that the sheet is in a clamped state, control the lifting plate to rise until the upper surface of the lifting plate is higher than the upper side height of the conveying roller. Step S22: Based on the fact that the upper surface of the lifting plate is higher than the upper side height of the conveying roller, control the first roller and the second roller to rotate in opposite directions until the sheet moves a first distance.

9. A method for processing a square muffler housing according to claim 7, wherein: The step S80 includes: Repeat steps S20 to S70 until the processing is completed; Wherein, in the first repetition process, the first distance is the first reserved length; in the second repetition process, the first distance is the second reserved length; in the third repetition process, the first distance is the third reserved length; in the fourth repetition process, the first distance is the fourth reserved length; The first reserved length, the second reserved length, the third reserved length, and the fourth reserved length satisfy the following relationships: L1 < L2; L1 < L3; L1 < L4; L1 < L5; L5 = L - L1 - L2 - L3 - L4; (L1 + L5) > L3; L2 = L4; Wherein, L is the total length of the sheet along the traction traveling direction; L1 is the first reserved length; L2 is the second reserved length; L3 is the third reserved length; L4 is the fourth reserved length; L5 is the remaining length of the sheet after being bent four times.

10. A method for processing a square muffler housing according to claim 7, wherein: The square muffler housing folding machine further includes an image unit; the image unit is used to capture the end face image of the sheet during the bending process and calculate the center of gravity of the part of the sheet that has been rolled by the traction unit. The step S50 includes: Step S51: Based on the fact that the square muffler housing folding machine is in the second state, obtain the center of gravity position calculated by the image unit. Step S52: Based on the fact that the center of gravity position is on the side of the traction unit close to the bending unit, control the first roller and the second roller to rotate in opposite directions at a first rotational speed. Step S53: Based on the fact that the center of gravity position is on the side of the traction unit far from the bending unit, control the first roller and the second roller to rotate in opposite directions at a second rotational speed; the second rotational speed is greater than the first rotational speed. Step S54: Repeat steps S52 to S53 until the sheet moves a second distance, and the second distance is less than the first distance.

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